Protactinium tetraiodide is a binary inorganic compound of protactinium metal and iodine with the chemical formula PaI4.[1][2]
| Identifiers | |
|---|---|
3D model (JSmol)
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| Properties | |
| I4Pa | |
| Molar mass | 738.65376 g·mol−1 |
| Appearance | black crystals |
| Related compounds | |
Related compounds
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uranium tetraiodide, thorium tetraiodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
editProtactinium tetraiodide can be prepared by reducing the pentaiodide with aluminum at about 400 °C:[3]
- 3PaI5 + Al → 3PaI4 + AlI3
Also, a reaction of hydrogen reduction of protactinium(V) iodide at 400 °C:[4]
- 2PaI5 + H2 → 2PaI4 + 2HI
Physical properties
editThe compound forms black or dark green crystals.[4] The structure is not known.[5]
Chemical properties
editThe compound is oxidized by antimony trioxide when heated in a vacuum:[6]
- 3PaI4 + Sb2O3 → 3PaOI2 + 2SbI3
The compound also reacts with quartz when heated:[dubious – discuss]
- 2PaI4 + SiO2 → 2PaOI2 + SiI4
References
edit- ^ "WebElements Periodic Table » Protactinium » protactinium tetraiodide". webelements.com.
- ^ Brown, David; Canterford, J. H.; Colton, Ray (1968). Halides of the Transition Elements: Halides of the lanthanides and actinides, by D. Brown. Wiley. p. 214. ISBN 978-0-470-10840-6. Retrieved 2 April 2024.
- ^ Advances in Inorganic Chemistry and Radiochemistry. Academic Press. 28 February 1970. p. 19. ISBN 978-0-08-057861-3. Retrieved 2 April 2024.
- ^ a b Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3509. ISBN 978-0-412-30120-9. Retrieved 2 April 2024.
- ^ Emeléus, Harry Julius; Sharpe, A. G. (1959). Advances in Inorganic Chemistry and Radiochemistry. Academic Press. p. 19. Retrieved 2 April 2024.
- ^ Morss, Lester R.; Edelstein, Norman M.; Fuger, J. (2010). The Chemistry of the Actinide and Transactinide Elements (PDF). Dordrecht: Springer. p. 874. ISBN 978-94-007-0210-3. Archived from the original (PDF) on 26 August 2017. Retrieved 3 April 2024.